import 'package:finalproject/theme/colors.dart';
import 'package:finalproject/theme/text_styles.dart';
import 'package:flutter/material.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:intl/intl.dart';

class ReportScreen extends StatefulWidget {
  const ReportScreen({super.key});

  @override
  State<ReportScreen> createState() => _ReportScreenState();
}

class _ReportScreenState extends State<ReportScreen> {
  final DateFormat _dateFormat = DateFormat('dd/MM/yyyy');

  final List<Map<String, dynamic>> _stockItems = [
    {'name': 'Tepung Terigu 1kg', 'stock': 18.0, 'status': 'Aman'},
    {'name': 'Gula Pasir 1kg', 'stock': 6.5, 'status': 'Rendah'},
    {'name': 'Telur 1kg', 'stock': 2.0, 'status': 'Kritis'},
    {'name': 'Mentega 500gr', 'stock': 4.0, 'status': 'Rendah'},
    {'name': 'Baking Powder', 'stock': 12.0, 'status': 'Aman'},
  ];

  final List<Map<String, dynamic>> _stockHistory = [
    {
      'date': DateTime.now().subtract(const Duration(days: 1)),
      'name': 'Tepung Terigu 1kg',
      'amount': 10,
    },
    {
      'date': DateTime.now().subtract(const Duration(days: 2)),
      'name': 'Gula Pasir 1kg',
      'amount': 6,
    },
    {
      'date': DateTime.now().subtract(const Duration(days: 4)),
      'name': 'Mentega 500gr',
      'amount': 3,
    },
    {
      'date': DateTime.now().subtract(const Duration(days: 6)),
      'name': 'Telur 1kg',
      'amount': 5,
    },
  ]..sort((a, b) => (b['date'] as DateTime).compareTo(a['date'] as DateTime));

  final List<Map<String, dynamic>> _predictionItems = [
    {
      'product': 'Donat Cokelat',
      'prediction': 120,
      'needs': 'Tepung 15kg, Gula 6kg, Telur 4kg',
      'date': DateTime.now(),
    },
    {
      'product': 'Roti Manis',
      'prediction': 90,
      'needs': 'Tepung 12kg, Gula 5kg, Mentega 3kg',
      'date': DateTime.now().subtract(const Duration(days: 2)),
    },
  ];

  final List<Map<String, dynamic>> _usageBars = [
    {'label': 'Tepung', 'value': 40.0, 'color': AppColors.primaryBrown},
    {'label': 'Gula', 'value': 28.0, 'color': AppColors.secondaryOrange},
    {'label': 'Telur', 'value': 18.0, 'color': AppColors.secondaryBlue},
    {'label': 'Mentega', 'value': 12.0, 'color': AppColors.secondaryGreen},
  ];

  final List<double> _demandTrend = [28, 32, 40, 36, 44, 50, 48];

  final List<Map<String, dynamic>> _usagePie = [
    {'label': 'Tepung', 'value': 40.0, 'color': AppColors.primaryBrown},
    {'label': 'Gula', 'value': 25.0, 'color': AppColors.secondaryOrange},
    {'label': 'Telur', 'value': 20.0, 'color': AppColors.secondaryBlue},
    {'label': 'Mentega', 'value': 15.0, 'color': AppColors.secondaryGreen},
  ];

  Color _statusColor(String status) {
    switch (status) {
      case 'Kritis':
        return AppColors.statusError;
      case 'Rendah':
        return AppColors.statusWarning;
      default:
        return AppColors.statusSuccess;
    }
  }

  @override
  Widget build(BuildContext context) {
    final width = MediaQuery.of(context).size.width;
    final cardWidth = (width - 48) / 2;

    return Scaffold(
      backgroundColor: AppColors.bgLight,
      appBar: AppBar(
        backgroundColor: AppColors.primaryBrown,
        elevation: 0,
        title: Text(
          'Laporan & Analitik',
          style: AppTextStyles.headlineLarge.copyWith(color: Colors.white),
        ),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Wrap(
              spacing: 16,
              runSpacing: 16,
              children: [
                _buildSummaryCard(
                  width: cardWidth,
                  title: 'Total Produk',
                  value: '24',
                  icon: Icons.shopping_bag,
                  color: AppColors.secondaryBlue,
                ),
                _buildSummaryCard(
                  width: cardWidth,
                  title: 'Total Bahan',
                  value: '18',
                  icon: Icons.inventory_2,
                  color: AppColors.primaryBrown,
                ),
                _buildSummaryCard(
                  width: cardWidth,
                  title: 'Stok Kritis',
                  value: '3',
                  icon: Icons.warning_amber_rounded,
                  color: AppColors.statusError,
                ),
                _buildSummaryCard(
                  width: cardWidth,
                  title: 'Total Prediksi',
                  value: '210',
                  icon: Icons.trending_up,
                  color: AppColors.statusSuccess,
                ),
              ],
            ),
            const SizedBox(height: 24),
            _buildSectionTitle('Laporan Stok Bahan'),
            const SizedBox(height: 12),
            _buildStockTable(),
            const SizedBox(height: 24),
            _buildSectionTitle('Riwayat Stok Masuk'),
            const SizedBox(height: 12),
            _buildStockHistory(),
            const SizedBox(height: 24),
            _buildSectionTitle('Laporan Prediksi Permintaan'),
            const SizedBox(height: 12),
            _buildPredictionList(),
            const SizedBox(height: 24),
            _buildSectionTitle('Grafik Penggunaan Bahan'),
            const SizedBox(height: 12),
            _buildCharts(),
            const SizedBox(height: 24),
            _buildSectionTitle('Bahan Kritis'),
            const SizedBox(height: 12),
            _buildCriticalItems(),
            const SizedBox(height: 24),
            _buildExportButton(),
            const SizedBox(height: 24),
          ],
        ),
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: 4,
        type: BottomNavigationBarType.fixed,
        onTap: (index) {
          switch (index) {
            case 0:
              Navigator.popUntil(context, (route) => route.isFirst);
              break;
            case 1:
              Navigator.pushNamed(context, '/products');
              break;
            case 2:
              Navigator.pushNamed(context, '/transaction');
              break;
            case 3:
              Navigator.pushNamed(context, '/prediction');
              break;
            case 5:
              Navigator.pushNamed(context, '/settings');
              break;
          }
        },
        items: const [
          BottomNavigationBarItem(
            icon: Icon(Icons.home_outlined),
            label: 'Dashboard',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.shopping_bag_outlined),
            label: 'Produk',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.shopping_cart_outlined),
            label: 'Stok Masuk',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.trending_up_outlined),
            label: 'Prediksi',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.description_outlined),
            label: 'Laporan',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.settings_outlined),
            label: 'Pengaturan',
          ),
        ],
      ),
    );
  }

  Widget _buildSummaryCard({
    required double width,
    required String title,
    required String value,
    required IconData icon,
    required Color color,
  }) {
    return Container(
      width: width,
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: AppColors.bgWhite,
        borderRadius: BorderRadius.circular(14),
        boxShadow: [AppColors.shadowLight],
      ),
      child: Row(
        children: [
          Container(
            width: 42,
            height: 42,
            decoration: BoxDecoration(
              color: color.withOpacity(0.15),
              borderRadius: BorderRadius.circular(12),
            ),
            child: Icon(icon, color: color, size: 22),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title,
                  style: AppTextStyles.bodySmall.copyWith(
                    color: AppColors.textTertiary,
                  ),
                ),
                const SizedBox(height: 6),
                Text(
                  value,
                  style: AppTextStyles.headlineSmall.copyWith(
                    color: AppColors.textPrimary,
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildSectionTitle(String title) {
    return Text(
      title,
      style: AppTextStyles.headlineSmall.copyWith(color: AppColors.textPrimary),
    );
  }

  Widget _buildStockTable() {
    return Container(
      decoration: BoxDecoration(
        color: AppColors.bgWhite,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [AppColors.shadowLight],
      ),
      child: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        child: DataTable(
          columns: const [
            DataColumn(label: Text('Nama Bahan')),
            DataColumn(label: Text('Stok Tersedia')),
            DataColumn(label: Text('Status')),
          ],
          rows:
              _stockItems.map((item) {
                final statusColor = _statusColor(item['status'] as String);
                return DataRow(
                  cells: [
                    DataCell(Text(item['name'] as String)),
                    DataCell(Text('${item['stock']} kg')),
                    DataCell(
                      Container(
                        padding: const EdgeInsets.symmetric(
                          horizontal: 10,
                          vertical: 4,
                        ),
                        decoration: BoxDecoration(
                          color: statusColor.withOpacity(0.15),
                          borderRadius: BorderRadius.circular(8),
                        ),
                        child: Text(
                          item['status'] as String,
                          style: AppTextStyles.labelSmall.copyWith(
                            color: statusColor,
                            fontWeight: FontWeight.w700,
                          ),
                        ),
                      ),
                    ),
                  ],
                );
              }).toList(),
        ),
      ),
    );
  }

  Widget _buildStockHistory() {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: AppColors.bgWhite,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [AppColors.shadowLight],
      ),
      child: Column(
        children:
            _stockHistory
                .map(
                  (entry) => ListTile(
                    contentPadding: const EdgeInsets.symmetric(horizontal: 8),
                    leading: Container(
                      width: 40,
                      height: 40,
                      decoration: BoxDecoration(
                        color: AppColors.primaryBrown.withOpacity(0.12),
                        borderRadius: BorderRadius.circular(10),
                      ),
                      child: const Icon(
                        Icons.add_circle_outline,
                        color: AppColors.primaryBrown,
                      ),
                    ),
                    title: Text(
                      entry['name'] as String,
                      style: AppTextStyles.labelLarge,
                    ),
                    subtitle: Text(
                      _dateFormat.format(entry['date'] as DateTime),
                      style: AppTextStyles.bodySmall.copyWith(
                        color: AppColors.textTertiary,
                      ),
                    ),
                    trailing: Text(
                      '+${entry['amount']} kg',
                      style: AppTextStyles.labelLarge.copyWith(
                        color: AppColors.statusSuccess,
                        fontWeight: FontWeight.w700,
                      ),
                    ),
                  ),
                )
                .toList(),
      ),
    );
  }

  Widget _buildPredictionList() {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: AppColors.bgWhite,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [AppColors.shadowLight],
      ),
      child: Column(
        children:
            _predictionItems
                .map(
                  (item) => ListTile(
                    contentPadding: const EdgeInsets.symmetric(horizontal: 8),
                    leading: Container(
                      width: 40,
                      height: 40,
                      decoration: BoxDecoration(
                        color: AppColors.secondaryBlue.withOpacity(0.12),
                        borderRadius: BorderRadius.circular(10),
                      ),
                      child: const Icon(
                        Icons.trending_up,
                        color: AppColors.secondaryBlue,
                      ),
                    ),
                    title: Text(
                      item['product'] as String,
                      style: AppTextStyles.labelLarge,
                    ),
                    subtitle: Text(
                      '${item['needs']} • ${_dateFormat.format(item['date'] as DateTime)}',
                      style: AppTextStyles.bodySmall.copyWith(
                        color: AppColors.textTertiary,
                      ),
                    ),
                    trailing: Text(
                      '${item['prediction']} unit',
                      style: AppTextStyles.labelLarge.copyWith(
                        color: AppColors.primaryBrown,
                        fontWeight: FontWeight.w700,
                      ),
                    ),
                  ),
                )
                .toList(),
      ),
    );
  }

  Widget _buildCharts() {
    return Column(
      children: [
        _buildChartCard(
          title: 'Bar Chart Penggunaan Bahan',
          child: SizedBox(
            height: 180,
            child: BarChart(
              BarChartData(
                borderData: FlBorderData(show: false),
                titlesData: FlTitlesData(
                  leftTitles: AxisTitles(
                    sideTitles: SideTitles(showTitles: false),
                  ),
                  rightTitles: AxisTitles(
                    sideTitles: SideTitles(showTitles: false),
                  ),
                  topTitles: AxisTitles(
                    sideTitles: SideTitles(showTitles: false),
                  ),
                  bottomTitles: AxisTitles(
                    sideTitles: SideTitles(
                      showTitles: true,
                      getTitlesWidget: (value, meta) {
                        if (value < 0 || value >= _usageBars.length) {
                          return const SizedBox.shrink();
                        }
                        return Padding(
                          padding: const EdgeInsets.only(top: 6),
                          child: Text(
                            _usageBars[value.toInt()]['label'] as String,
                            style: AppTextStyles.labelSmall.copyWith(
                              color: AppColors.textSecondary,
                            ),
                          ),
                        );
                      },
                    ),
                  ),
                ),
                barGroups:
                    _usageBars.asMap().entries.map((entry) {
                      return BarChartGroupData(
                        x: entry.key,
                        barRods: [
                          BarChartRodData(
                            toY: entry.value['value'] as double,
                            color: entry.value['color'] as Color,
                            width: 18,
                            borderRadius: BorderRadius.circular(6),
                          ),
                        ],
                      );
                    }).toList(),
              ),
            ),
          ),
        ),
        const SizedBox(height: 16),
        _buildChartCard(
          title: 'Line Chart Permintaan Produk',
          child: SizedBox(
            height: 180,
            child: LineChart(
              LineChartData(
                borderData: FlBorderData(show: false),
                gridData: FlGridData(show: false),
                titlesData: FlTitlesData(
                  leftTitles: AxisTitles(
                    sideTitles: SideTitles(showTitles: false),
                  ),
                  rightTitles: AxisTitles(
                    sideTitles: SideTitles(showTitles: false),
                  ),
                  topTitles: AxisTitles(
                    sideTitles: SideTitles(showTitles: false),
                  ),
                  bottomTitles: AxisTitles(
                    sideTitles: SideTitles(
                      showTitles: true,
                      getTitlesWidget: (value, meta) {
                        return Padding(
                          padding: const EdgeInsets.only(top: 6),
                          child: Text(
                            'M${value.toInt() + 1}',
                            style: AppTextStyles.labelSmall.copyWith(
                              color: AppColors.textSecondary,
                            ),
                          ),
                        );
                      },
                    ),
                  ),
                ),
                lineBarsData: [
                  LineChartBarData(
                    spots:
                        _demandTrend
                            .asMap()
                            .entries
                            .map(
                              (entry) =>
                                  FlSpot(entry.key.toDouble(), entry.value),
                            )
                            .toList(),
                    isCurved: true,
                    color: AppColors.secondaryBlue,
                    barWidth: 3,
                    dotData: FlDotData(show: false),
                    belowBarData: BarAreaData(
                      show: true,
                      color: AppColors.secondaryBlue.withOpacity(0.15),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
        const SizedBox(height: 16),
        _buildChartCard(
          title: 'Pie Chart Bahan Paling Sering Digunakan',
          child: SizedBox(
            height: 200,
            child: PieChart(
              PieChartData(
                sectionsSpace: 2,
                centerSpaceRadius: 40,
                sections:
                    _usagePie.map((entry) {
                      return PieChartSectionData(
                        value: entry['value'] as double,
                        color: entry['color'] as Color,
                        radius: 50,
                        showTitle: true,
                        title: '${entry['value']}%',
                        titleStyle: AppTextStyles.labelSmall.copyWith(
                          color: Colors.white,
                          fontWeight: FontWeight.w700,
                        ),
                      );
                    }).toList(),
              ),
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildChartCard({required String title, required Widget child}) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: AppColors.bgWhite,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [AppColors.shadowLight],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            title,
            style: AppTextStyles.headlineSmall.copyWith(
              color: AppColors.textPrimary,
            ),
          ),
          const SizedBox(height: 12),
          child,
        ],
      ),
    );
  }

  Widget _buildCriticalItems() {
    final criticalItems =
        _stockItems.where((item) => item['status'] == 'Kritis').toList();

    if (criticalItems.isEmpty) {
      return Container(
        padding: const EdgeInsets.all(16),
        decoration: BoxDecoration(
          color: AppColors.bgWhite,
          borderRadius: BorderRadius.circular(16),
          boxShadow: [AppColors.shadowLight],
        ),
        child: Text(
          'Tidak ada bahan kritis saat ini.',
          style: AppTextStyles.bodyMedium.copyWith(
            color: AppColors.textSecondary,
          ),
        ),
      );
    }

    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: AppColors.bgWhite,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [AppColors.shadowLight],
      ),
      child: Column(
        children:
            criticalItems
                .map(
                  (item) => ListTile(
                    contentPadding: const EdgeInsets.symmetric(horizontal: 8),
                    leading: Container(
                      width: 40,
                      height: 40,
                      decoration: BoxDecoration(
                        color: AppColors.statusError.withOpacity(0.12),
                        borderRadius: BorderRadius.circular(10),
                      ),
                      child: const Icon(
                        Icons.warning_amber_rounded,
                        color: AppColors.statusError,
                      ),
                    ),
                    title: Text(
                      item['name'] as String,
                      style: AppTextStyles.labelLarge,
                    ),
                    subtitle: Text(
                      'Sisa stok: ${item['stock']} kg',
                      style: AppTextStyles.bodySmall.copyWith(
                        color: AppColors.textTertiary,
                      ),
                    ),
                    trailing: ElevatedButton(
                      onPressed: () {
                        Navigator.of(context).pushNamed('/transaction');
                      },
                      style: ElevatedButton.styleFrom(
                        backgroundColor: AppColors.statusSuccess,
                        foregroundColor: Colors.white,
                        padding: const EdgeInsets.symmetric(
                          horizontal: 12,
                          vertical: 8,
                        ),
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(10),
                        ),
                      ),
                      child: const Text(
                        'Tambah Stok',
                        style: TextStyle(fontSize: 12),
                      ),
                    ),
                  ),
                )
                .toList(),
      ),
    );
  }

  Widget _buildExportButton() {
    return SizedBox(
      width: double.infinity,
      child: ElevatedButton.icon(
        onPressed: () {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(
              content: Text('Export laporan masih menggunakan data dummy.'),
            ),
          );
        },
        icon: const Icon(Icons.download_rounded),
        label: const Text('Export Laporan'),
        style: ElevatedButton.styleFrom(
          backgroundColor: AppColors.primaryBrown,
          foregroundColor: Colors.white,
          padding: const EdgeInsets.symmetric(vertical: 14),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
        ),
      ),
    );
  }
}